There are many countries that still remain in the primary and secondary industries. The representative countries are Africa and Southeast Asia.

Because it did not improve physical ability.

The first revolution, which is transformed from a hunting society to an agricultural society, Following the Second Revolution, Alvin Toffler wrote in his book "The Third Wave" that intelligence dominates the world He predicted an advanced information society. The fourth industrial revolution, represented by the Internet of things, is emerging in recent years.

The development of computer communication technology, represented by the Internet, The basic constraints of economic activity are the ability to solve the problems of time and space, And recently it has become possible to create 3D virtual reality A new dimension of virtual world is evolving in virtual space.